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针对圆锯片切割石材过程中复杂的动态力学行为,依据脆性材料断裂理论,基于有限元与光滑粒子耦合算法(SPH-FEM)模拟了锯片-石材切割系统的复杂动力学加工过程。模拟结果表明:在切割过程中石材去除过程分为塑性变形阶段、小规模挤裂阶段、大规模挤裂阶段和重复大规模挤裂阶段;切割过程中切割力从零开始,接触石材先瞬间增大,然后又减小,最后在一定范围内平稳波动;根据锯片结构表面等效应力分布情况确定了模型最易破坏的区域。通过试验对比验证了该耦合算法的可行性,表明SPH-FEM耦合算法能准确获取切割石材时系统的动力学响应信息,为揭示锯路拓展及石材动态损伤、成屑机理提供理论支撑。
Aiming at the complex dynamic mechanical behavior of circular saw blade during the cutting of stone, the complex dynamic machining process of saw blade - stone cutting system is simulated based on the fracture theory of brittle material based on the finite element method and the smooth particle coupling algorithm (SPH-FEM). The simulation results show that during the cutting process, the stone removal process is divided into plastic deformation stage, small-scale fracture stage, large-scale fracture stage and repeated large-scale fracture stage. During the cutting process, the cutting force starts from scratch, Large, and then reduce, and finally fluctuate within a certain range; According to the distribution of the equivalent stress of the saw blade structure surface, the most damageable area of the model is determined. The feasibility of this coupling algorithm is verified through experimental comparison, which shows that the SPH-FEM coupling algorithm can accurately obtain the dynamic response of the system when cutting stone, which can provide theoretical support for revealing the expansion of the sawing path, the dynamic damage of the stone and the formation of the chip.